#pragma once

#include "Poller.hpp"
#include "Timestamp.hpp"

#include <vector>
#include <sys/epoll.h>

class Channel;

/**
 * epoll的使用
 * epoll_create
 * epoll_ctl add/mod/del
 * epoll_wait
 */

class EPollPoller:public Poller
{
public:
    EPollPoller(EventLoop *loop);
    ~EPollPoller() override;

    //重写基类Poller的抽象方法
    Timestamp poll(int timeoutMs,ChannelList *activeChannels) override;
    void updateChannel(Channel *channel) override;
    void removeChannel(Channel *channel) override;
private:
    using EventList=std::vector<struct epoll_event> ;

    static const int kInitEventListSize = 16;

    //填写活跃的连接
    void fillActiveChannels(int numEvents,ChannelList *activeChannels) const;
    //更新channel通道
    void update(int operation,Channel *channel);

    int epollfd_;
    EventList events_;
};